Umbrella



FIG. 1 is a perspective view of the invention;

FIG. 2 is a front view of the invention;

FIG. 3 is a side view of the invention;

FIG. 4 is a top view of the invention;

FIG. 5 is a bottom view of the invention; and,

FIG. 6 is a front view of the invention, in a folded position.

The portions of the umbrella that are shown in broken lines in FIG. 5 are for illustrative purposes only, and form no part of the claimed design. 

The ornamental design for an umbrella, as shown and described. 